CN105334147B - Particulate matter on-line monitoring system and method based on β ray methods and light scattering method - Google Patents
Particulate matter on-line monitoring system and method based on β ray methods and light scattering method Download PDFInfo
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- CN105334147B CN105334147B CN201510878762.6A CN201510878762A CN105334147B CN 105334147 B CN105334147 B CN 105334147B CN 201510878762 A CN201510878762 A CN 201510878762A CN 105334147 B CN105334147 B CN 105334147B
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Abstract
The present invention provides a kind of particulate matter on-line monitoring system and method based on β ray methods and light scattering method, the concentration for particulate matter in online real―time precision measurment flue gas.The present invention combines the advantages of β ray methods and light scattering method, realizes that β ray methods measurement result calibrates the reference of light scattering method measurement result by internal reference method, so as to fulfill the concentration of particulate matter in online real―time precision measurment flue gas.The measurement result of the present invention influences from characteristics such as particulate matter size, color, chemical composition changes, has the advantages that precision is high, it is several to go out in real time.
Description
Technical field
The invention belongs to environmental monitoring technology field, and it is online to be related to a kind of particulate matter based on β ray methods and light scattering method
Monitor system and method.
Background technology
According to country《Prevention and control of air pollution action plan》Requirement, to accelerate coal-burning boiler and the existing dedusting of industrial furnace
Facility upgrading, it is ensured that granular material discharged concentration stably reaching standard discharge.What country promulgated《Thermal power plant's Air Pollutant Emission mark
It is accurate》（GB13223-2011）Granular material discharged concentration is down to 30 mg/m during stationary source is vented etc. series of standards3Below.
At present, most of more than 300,000 kilowatts units of unit installed capacity employ electrostatic precipitator and the dedusting skill of the outer wet desulphurization of stove
Art, particle concentration are less than 50 mg/m3。
People's innovation and creation in recent years a variety of particle detection methods and detection device, including the filter of traditional classical
Film weight method：This method is with defined traffic sampling, by the particle collection in air in the filter with certain diameter porosity
On film, then by weighing the quality before and after filter membrane sampling, by the quality of its particulate matter of poor quality for trying to achieve trapping, finally by this
The ratio between one mass and sampled air volume are the mass concentration of particulate matter.This method is current national standard method.
With scientific and technological progress, there is many new in-situ check and test methods and equipment, be than more typical representative：
1）Light scattering method：The basic principle of this method is that the illumination sent with a laser light source is incident upon on tested particulate matter
Cause light scattering, receive the signal of scattering light, including scattering light number and light intensity with photo-electric conversion element on certain direction.
The number of the scattering light detected represents population, and light intensity signal represents the size of particle.This method can directly obtain population,
But to be converted into mass concentration by counting calculating.
2）β ray methods：When β radiation exposure media, β particles are inhaled with the mutual collision loss energy of electronics in medium
Receive, under low-energy condition, degree of absorption depend on medium quality, with particle size, component, color and dispersity without
Close.Environmental gas sucks sampling pipe by sampling pump, goes out by filter paper heel row, and particulate matter is deposited on filter paper, sinks when β rays pass through
Energy attenuation when accumulating the filter paper of particulate matter, by being measured to front and rear β ray energies of decaying, can calculate the matter of particulate matter
Measure concentration.
3）Trace oscillating balance method：Trace oscillating balance method is using a vibration conical hollow in mass sensor
Pipe, replaceable filter membrane is installed in its vibration end, and frequency of oscillation depends on conical pipe feature and its quality.When sampling air flow passes through
Filter membrane, particulate matter therein are deposited on filter membrane, and the mass change of filter membrane causes the change of frequency of oscillation, is become by frequency of oscillation
Change the quality for calculating and being deposited on particulate matter on filter membrane, the period is calculated further according to flow, site environment temperature and air pressure
The mass concentration of grain thing mark.
Filter membrane weight method principle is simple, and determination data is reliable, is existing national standard method, can directly measure to inhale
Enter the mass concentration of particulate matter.But in continuous mode, there are the shortcomings of complicated, time-consuming, equipment is more, it is impossible to realizes
Line continuous monitoring.Light scattering method can realize on-line real-time measuremen, but this technology for detection to signal mainly contain population
With particle size information, and the quality information of particulate matter is not contained, and the measurement accuracy of light scattering method is relatively low.β ray methods are direct
Measure mass concentration, it is not necessary to conversion and calibration, high certainty of measurement, and measurement result is from particulate matter size, color, chemical group
Influenced into characteristics such as changes, but detection process needs a period of time, it is impossible to real-time release measurement result.Though trace oscillating balance method
Right high certainty of measurement, but instrument price is high, and easily influenced by humidity, detection process needs a period of time, it is impossible to hair in real time
Cloth measurement result.A kind of method and system there is no to realize the concentration of particulate matter in online real―time precision measurment flue gas at present.
The content of the invention
Existing in the prior art in order to solve the problems, such as, the object of the present invention is to provide one kind to be based on β ray methods and light scattering
The particulate matter on-line monitoring system and method for method, the concentration for particulate matter in online real―time precision measurment flue gas.
The present invention operation principle be：Measure the concentration of particulate matter in flue gas at the same time using β ray methods and light scattering method, lead to
Cross internal reference method and realize that β ray methods measurement result calibrates the reference of light scattering method measurement result, so as to fulfill online real-time
The concentration of particulate matter in accurate measurement flue gas.
The present invention provides a kind of particulate matter on-line monitoring system based on β ray methods and light scattering method, the particulate matter
On-line monitoring system includes sampling unit, β ray methods detection unit, light scattering method detection unit, control unit；
The sampling unit is used to gather flue gas from flue；
The β ray methods detection unit is used for the concentration using particulate matter in β ray methods measurement flue gas；
The light scattering method detection unit is used for the concentration using particulate matter in light scattering method measurement flue gas；
Described control unit is used to control β ray methods detection unit and light scattering method detection unit, and data acquisition with
Processing；
The sampling unit is respectively communicated with β ray methods detection unit and light scattering method detection unit by pipeline, and the β is penetrated
Collimation method detection unit and light scattering method detection unit are communicated to connect with control unit respectively.
Further, the β ray methods detection unit includes β ray methods detection device, the stream being sequentially communicated by pipeline
Gauge, sampling pump.
Further, the light scattering method detection unit includes the jet pump being sequentially communicated by pipeline and light scattering method inspection
Survey device.
Present invention also offers a kind of particulate matter on-line monitoring method based on β ray methods and light scattering method, the method
Include the following steps：
（1）β ray methods detection unit and light scattering method detection unit gather flue gas, β rays by same sampling unit
The intermittent extraction flue gas of method detection unit, light scattering method detection unit continous way extract flue gas；Flue gas divides after entering sampling unit
Into two-way, first via flue gas leads to β ray method detection units, and the second road flue gas leads to light scattering method detection unit；
（2）During β ray methods detection unit extracts flue gas, β ray methods detection unit is using the β ray methods measurement first via
The mean concentration C1 of particulate matter in flue gas；At the same time, light scattering method detection unit measures the second road flue gas using light scattering method
The real-time concentration C2 of middle particulate matter；
（3）Reference method of the control unit using β ray methods as light scattering method, is averaged with particulate matter in first via flue gas
Concentration C 1 is used as reference value, in the second road flue gas particulate matter real-time concentration C2 carry out reference calibration so that calculate by
The real-time concentration C of particulate matter in the flue gas of calibration.
Beneficial effects of the present invention：The present invention combines the advantages of β ray methods and light scattering method, real by internal reference method
Existing β ray methods measurement result calibrates the reference of light scattering method measurement result, so as to fulfill in online real―time precision measurment flue gas
The concentration of particulate matter.The measurement result of the present invention influences from characteristics such as particulate matter size, color, chemical composition changes, has
Precision is high, goes out the advantages that several in real time.
Brief description of the drawings
Fig. 1 is the structure diagram of the particulate matter on-line monitoring system based on β ray methods and light scattering method.
Embodiment
The invention will be further described with reference to the accompanying drawings and examples：
A kind of particulate matter on-line monitoring system based on β ray methods and light scattering method as shown in Figure 1, including sampling unit
101st, β ray methods detection unit 102, light scattering method detection unit 103, control unit 104；
Sampling unit 101 is used to gather flue gas from flue；
β ray methods detection unit 102 is used for the concentration using particulate matter in β ray methods measurement flue gas；
Light scattering method detection unit 103 is used for the concentration using particulate matter in light scattering method measurement flue gas；
Control unit 104 is used to control β ray methods detection unit and light scattering method detection unit, and data acquisition and place
Reason；
Sampling unit 101 is respectively communicated with β ray methods detection unit 102 and light scattering method detection unit 103, β by pipeline
Ray method detection unit 102 and light scattering method detection unit 103 are communicated to connect with control unit 104 respectively.
β ray methods detection unit 102 include be sequentially communicated by pipeline β ray methods detection device 201, flowmeter 202,
Sampling pump 203.
Light scattering method detection unit 103 includes jet pump 204 and the light scattering method detection device being sequentially communicated by pipeline
205。
The course of work of above-mentioned particulate matter on-line monitoring system：
β ray methods detection unit 102 and light scattering method detection unit 103 gather flue gas by same sampling unit 101,
The intermittent extraction flue gas of sampling pump 203,204 continous way of jet pump extract flue gas.Flue gas is divided into two after entering sampling unit 101
Road, first via flue gas are directly entered β ray methods detection device 201, and the second road flue gas is interior with fixation in jet pump 204 with carrier gas
Dilution ratio mixing after enter light scattering method detection device 205.
During sampling pump 203 extracts flue gas, β ray methods detection device 201 measures the matter of particulate matter in first via flue gas
Amount, flowmeter 202 measure the flow of first via flue gas, and control unit 104 calculates first via flue gas according to corresponding measurement result
Mean concentration C1；At the same time, particulate matter is real-time in the second road flue gas after the measurement of light scattering method detection device 205 dilutes
Concentration, control unit 104 according to the dilution ratio of corresponding measurement result and flue gas calculate dilution before the second road flue gas in
The real-time concentration C2 of grain thing.
Reference method of the control unit 104 using β ray methods as light scattering method, is averaged with particulate matter in first via flue gas
Concentration C 1 is used as reference value, in the second road flue gas particulate matter real-time concentration C2 carry out reference calibration so that calculate by
The real-time concentration C of particulate matter in the flue gas of calibration.
The technology contents described above that the present invention is only further illustrated with embodiment, in order to which reader is easier to understand,
But embodiments of the present invention are not represented and are only limitted to this, any technology done according to the present invention extends or recreation, is sent out by this
Bright protection.
Claims (4)
1. a kind of particulate matter on-line monitoring system based on β ray methods and light scattering method, including the detection of sampling unit, β ray methods
Unit, light scattering method detection unit, control unit；It is characterized in that, sampling unit divides two-way to be respectively communicated with β ray methods detection list
Member and light scattering method detection unit, for measuring the concentration of particulate matter in flue gas at the same time, light scattering is calibrated by β ray methods reference
Method, realizes the online real―time precision measurment of particle concentration in flue gas；
The sampling unit is divided into independent parallel two-way, wherein β ray method detection units are connected all the way, another way connection light
Scattering method detection unit；
The sampling unit is used to gather flue gas from flue；
The β ray methods detection unit is used for the concentration using particulate matter in β ray methods measurement flue gas；
The light scattering method detection unit is used for the concentration using particulate matter in light scattering method measurement flue gas；
Described control unit is used to control β ray methods detection unit and light scattering method detection unit, and data acquisition and procession.
2. particulate matter on-line monitoring system according to claim 1, it is characterised in that：
The β ray methods detection unit include be sequentially communicated by pipeline β ray methods detection device, flowmeter, sampling pump, use
The reference of light scattering method measurement result is calibrated in being realized by internal reference method.
3. particulate matter on-line monitoring system according to claim 1, it is characterised in that：
The light scattering method detection unit includes jet pump and the light scattering method detection device being sequentially communicated by pipeline, for inciting somebody to action
Flue gas enters light scattering method detection device after being mixed with carrier gas in jet pump with fixed dilution ratio, realizes in flue gas
The On-line sampling system of grain thing concentration.
4. a kind of particulate matter on-line monitoring method based on β ray methods and light scattering method, described method includes following steps：
(1) flue gas is divided into β ray methods detection unit and light scattering method detection parallel by same sampling unit after gathering flue gas
Unit two-way, first via β ray methods detection unit are intermittent extraction flue gas, and the second road light scattering method detection unit is continous way
Extract flue gas；
(2) during β ray methods detection unit extracts flue gas, β ray methods detection unit is passed through by intermittent extraction flue gas
Flowmeter quantitatively extracts the volume of flue gas, and the mean concentration C1 of particulate matter in first via flue gas is measured using β ray methods；It is same with this
When, flue gas is mixed with carrier gas in jet pump with fixed dilution ratio, and continuous drawing enters light scattering method detection dress afterwards
Put, the diluted concentration of particulate matter in the second road flue gas is measured using light scattering method, real-time concentration C2 is obtained multiplied by with thinner ratio；
(3) reference method of the control unit using β ray methods as light scattering method, with the mean concentration of particulate matter in first via flue gas
C1 carries out reference calibration, so as to calculate by calibration as reference value to the real-time concentration C2 of particulate matter in the second road flue gas
Flue gas in particulate matter real-time concentration C.
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| CN108645767B (en) * | 2018-05-02 | 2019-08-30 | 华中科技大学 | The method for coupling light scattering and beta-ray measurement coal-fired flue-gas particulate matter quality concentration |
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| CN113670783A (en) * | 2021-03-22 | 2021-11-19 | 王庚 | Method and device for directly measuring and calculating concentration of particulate matters in gas based on beta-ray method |
| CN113252525A (en) * | 2021-04-28 | 2021-08-13 | 深圳市无眼界科技有限公司 | Particulate matter on-line monitoring system based on beta ray and light scattering method |
| CN113686746B (en) * | 2021-09-28 | 2023-09-15 | 暨南大学 | PM (particulate matter) 2.5 Online mass concentration real-time compensation device and method |
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